I don't know, maybe he's a big fan of the Barbie movie (now available on streaming on Amazon Prime videos) and is cosplaying as the Patriarchy. Not even a Ken, but like, the literal personification of the Patriarchy.
Cowboy and cowgirl costumes are fun to wear, but they are just that, costumes. The only acceptable reasons to pretend to be someone you're not on camera is either you get paid for it as your job, or if it is really, really funny.